How can I improve the performance of my Audi A5's exhaust system?

I recently installed a new performance exhaust system on my Audi A5, but it doesn't seem to be delivering the expected boost in performance. What could be causing this and is there any way to improve it?

First, make sure that the exhaust system was installed correctly and all connections are secure. If that checks out, consider upgrading to a high-flow catalytic converter or adding a header to further improve exhaust flow.

Is your car tuned to optimize the performance of your new exhaust system? If not, consider getting a performance tune to see the full potential of your upgrades.